Abstract
A short critical review is presented concerning the physical interpretation of electron and positron production data at the GSI accelerator in Darmstadt. The only reliable conclusions seem to be that the creation mechanism is a strong field effect and that the phenomenon is largely independent of the characteristic time of the collision. Before looking for new (exotic) physics it seems reasonable to inquire whether non-perturbative QED is fully understood. Following this motivation a rigorous but, at the same time, sufficiently explicit nonperturbative calculation scheme is developed, for QED in strong fields of short duration. The possible occurrence of correlated e+e− narrow structures is discussed in this framework.
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